What is Black Hat SEO (Search engine Optimization gone poor)

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Hidden Text – if text or links are invisible to the website visitor but can be seen by search engine spiders then they are considered hidden.In the past people would simply make the text too small to read by using a 1 point font or make it the same color as the background. Now that search engines have built in algorithms to combat that, spammers are using cascading style sheets (CSS) to hide text or using <div> tags set to not display text on the page. It is boils down to this: it is considered hidden if the text or link is invisible to the website visitor but can be seen by search engine spiders.Search engines can easily spot this today so it is best to avoid it altogether.

Doorway Pages – pages that solely exist to rank well in the search engines. Sometimes these pages are ugly, containing paragraph after paragraph of meaningless text. Most the time doorway pages are orphaned pages meaning they are not part of the site's regular navigation.